Historian and biographer Jane Rogoyska explains how more than 20,000 Polish prisoners-of-war were murdered on Stalin’s orders in the spring of 1940. Plus, she explores the decades-long coverup that saw the Soviet Union accuse its Nazi foes of committing the atrocity.

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Read more: Roger Moorhouse tells the story of the brutal 1939 invasion of Poland

Jane Rogoyska is the author of Surviving Katyn: Stalin’s Polish Massacre and the Search for Truth (Oneworld, 2021)

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